The sum of three consecutive even numbers is 84. If the middle number is 2x + 4, what is the value of x?
consecutive means in a row so the one before it would be: (2x + 4) – 1 = 2x + 3
the one after it would be (2x + 4) + 1 = 2x + 5
first number: 2x + 3 middle number: 2x + 4 last number: 2x + 5
2x + 3 + 2x + 4 + 2x + 5 = 84
6x + 12 = 84
6x = 72
x = 12